code.delx.au - gnu-emacs/blob - lib-src/emacsclient.c

   1 /* Client process that communicates with GNU Emacs acting as server.
   2    Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2003, 2004
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 #define NO_SHORTNAMES
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #undef signal
  30
  31 #include <ctype.h>
  32 #include <stdio.h>
  33 #include <getopt.h>
  34 #ifdef HAVE_UNISTD_H
  35 #include <unistd.h>
  36 #endif
  37
  38 #ifdef VMS
  39 # include "vms-pwd.h"
  40 #else
  41 # include <pwd.h>
  42 #endif /* not VMS */
  43
  44 #include <signal.h>
  45 #include <errno.h>
  46
  47 \f
  48 char *getenv (), *getwd ();
  49 char *getcwd ();
  50
  51 /* This is defined with -D from the compilation command,
  52    which extracts it from ../lisp/version.el.  */
  53
  54 #ifndef VERSION
  55 #define VERSION "unspecified"
  56 #endif
  57 \f
  58 /* Name used to invoke this program.  */
  59 char *progname;
  60
  61 /* The first argument to main. */
  62 int main_argc;
  63
  64 /* The second argument to main. */
  65 char **main_argv;
  66
  67 /* Nonzero means don't wait for a response from Emacs.  --no-wait.  */
  68 int nowait = 0;
  69
  70 /* Nonzero means args are expressions to be evaluated.  --eval.  */
  71 int eval = 0;
  72
  73 /* Nonzero means open a new graphical frame. */
  74 int window_system = 0;
  75
  76 /* The display on which Emacs should work.  --display.  */
  77 char *display = NULL;
  78
  79 /* Nonzero means open a new Emacs frame on the current terminal. */
  80 int tty = 0;
  81
  82 /* If non-NULL, the name of an editor to fallback to if the server
  83    is not running.  --alternate-editor.   */
  84 const char * alternate_editor = NULL;
  85
  86 /* If non-NULL, the filename of the UNIX socket.  */
  87 char *socket_name = NULL;
  88
  89 void print_help_and_exit ();
  90
  91 struct option longopts[] =
  92 {
  93   { "no-wait",  no_argument,       NULL, 'n' },
  94   { "eval",     no_argument,       NULL, 'e' },
  95   { "help",     no_argument,       NULL, 'H' },
  96   { "version",  no_argument,       NULL, 'V' },
  97   { "tty",      no_argument,       NULL, 't' },
  98   { "current-frame", no_argument,  NULL, 'c' },
  99   { "alternate-editor", required_argument, NULL, 'a' },
 100   { "socket-name",      required_argument, NULL, 's' },
 101   { "display",  required_argument, NULL, 'd' },
 102   { 0, 0, 0, 0 }
 103 };
 104
 105 /* Decode the options from argv and argc.
 106    The global variable `optind' will say how many arguments we used up.  */
 107
 108 void
 109 decode_options (argc, argv)
 110      int argc;
 111      char **argv;
 112 {
 113   alternate_editor = getenv ("ALTERNATE_EDITOR");
 114   display = getenv ("DISPLAY");
 115   if (display && strlen (display) == 0)
 116     display = NULL;
 117
 118   if (display)
 119     window_system = 1;
 120   else
 121     tty = 1;
 122
 123   while (1)
 124     {
 125       int opt = getopt_long (argc, argv,
 126                              "VHnea:s:d:tc", longopts, 0);
 127
 128       if (opt == EOF)
 129         break;
 130
 131       switch (opt)
 132         {
 133         case 0:
 134           /* If getopt returns 0, then it has already processed a
 135              long-named option.  We should do nothing.  */
 136           break;
 137
 138         case 'a':
 139           alternate_editor = optarg;
 140           break;
 141
 142         case 's':
 143           socket_name = optarg;
 144           break;
 145
 146         case 'd':
 147           display = optarg;
 148           break;
 149
 150         case 'n':
 151           nowait = 1;
 152           break;
 153
 154         case 'e':
 155           eval = 1;
 156           break;
 157
 158         case 'V':
 159           printf ("emacsclient %s\n", VERSION);
 160           exit (0);
 161           break;
 162
 163         case 't':
 164           tty = 1;
 165           window_system = 0;
 166           break;
 167
 168         case 'c':
 169           window_system = 0;
 170           tty = 0;
 171           break;
 172
 173         case 'H':
 174           print_help_and_exit ();
 175           break;
 176
 177         default:
 178           fprintf (stderr, "Try `%s --help' for more information\n", progname);
 179           exit (1);
 180           break;
 181         }
 182     }
 183
 184   if (tty) {
 185     nowait = 0;
 186     display = 0;
 187   }
 188 }
 189
 190 void
 191 print_help_and_exit ()
 192 {
 193   printf (
 194           "Usage: %s [OPTIONS] FILE...\n\
 195 Tell the Emacs server to visit the specified files.\n\
 196 Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\
 197 \n\
 198 The following OPTIONS are accepted:\n\
 199 -V, --version           Just print a version info and return\n\
 200 -H, --help              Print this usage information message\n\
 201 -t, --tty               Open a new Emacs frame on the current terminal\n\
 202 -c, --current-frame     Do not create a new frame; use the current Emacs frame\n\
 203 -n, --no-wait           Don't wait for the server to return\n\
 204 -e, --eval              Evaluate the FILE arguments as ELisp expressions\n\
 205 -d, --display=DISPLAY   Visit the file in the given display\n\
 206 -s, --socket-name=FILENAME\n\
 207                         Set the filename of the UNIX socket for communication\n\
 208 -a, --alternate-editor=EDITOR\n\
 209                         Editor to fallback to if the server is not running\n\
 210 \n\
 211 Report bugs to bug-gnu-emacs@gnu.org.\n", progname);
 212   exit (0);
 213 }
 214
 215 /* In STR, insert a & before each &, each space, each newline, and
 216    any initial -.  Change spaces to underscores, too, so that the
 217    return value never contains a space.
 218
 219    Does not change the string.  Outputs the result to STREAM.  */
 220
 221 void
 222 quote_argument (str, stream)
 223      char *str;
 224      FILE *stream;
 225 {
 226   char *copy = (char *) malloc (strlen (str) * 2 + 1);
 227   char *p, *q;
 228
 229   p = str;
 230   q = copy;
 231   while (*p)
 232     {
 233       if (*p == ' ')
 234         {
 235           *q++ = '&';
 236           *q++ = '_';
 237           p++;
 238         }
 239       else if (*p == '\n')
 240         {
 241           *q++ = '&';
 242           *q++ = 'n';
 243           p++;
 244         }
 245       else
 246         {
 247           if (*p == '&' || (*p == '-' && p == str))
 248             *q++ = '&';
 249           *q++ = *p++;
 250         }
 251     }
 252   *q++ = 0;
 253
 254   fprintf (stream, copy);
 255
 256   free (copy);
 257 }
 258
 259
 260 /* The inverse of quote_argument.  Removes quoting in string STR by
 261    modifying the string in place.   Returns STR. */
 262
 263 char *
 264 unquote_argument (str)
 265      char *str;
 266 {
 267   char *p, *q;
 268
 269   if (! str)
 270     return str;
 271
 272   p = str;
 273   q = str;
 274   while (*p)
 275     {
 276       if (*p == '&')
 277         {
 278           p++;
 279           if (*p == '&')
 280             *p = '&';
 281           else if (*p == '_')
 282             *p = ' ';
 283           else if (*p == 'n')
 284             *p = '\n';
 285           else if (*p == '-')
 286             *p = '-';
 287         }
 288       *q++ = *p++;
 289     }
 290   *q = 0;
 291   return str;
 292 }
 293
 294 /* Like malloc but get fatal error if memory is exhausted.  */
 295
 296 long *
 297 xmalloc (size)
 298      unsigned int size;
 299 {
 300   long *result = (long *) malloc (size);
 301   if (result == NULL)
 302   {
 303     perror ("malloc");
 304     exit (1);
 305   }
 306   return result;
 307 }
 308 \f
 309 /*
 310   Try to run a different command, or --if no alternate editor is
 311   defined-- exit with an errorcode.
 312 */
 313 void
 314 fail (void)
 315 {
 316   if (alternate_editor)
 317     {
 318       int i = optind - 1;
 319       execvp (alternate_editor, main_argv + i);
 320       return;
 321     }
 322   else
 323     {
 324       exit (1);
 325     }
 326 }
 327
 328 /* The process id of Emacs. */
 329 int emacs_pid;
 330
 331 /* File handles for communicating with Emacs. */
 332 FILE *out, *in;
 333
 334 /* A signal handler that passes the signal to the Emacs process.
 335    Useful for SIGWINCH.  */
 336
 337 SIGTYPE
 338 pass_signal_to_emacs (int signalnum)
 339 {
 340   int old_errno = errno;
 341
 342   if (emacs_pid)
 343     kill (emacs_pid, signalnum);
 344
 345   signal (signalnum, pass_signal_to_emacs);
 346   errno = old_errno;
 347 }
 348
 349 /* Signal handler for SIGCONT; notify the Emacs process that it can
 350    now resume our tty frame.  */
 351
 352 SIGTYPE
 353 handle_sigcont (int signalnum)
 354 {
 355   int old_errno = errno;
 356
 357   if (tcgetpgrp (1) == getpgrp ())
 358     {
 359       /* We are in the foreground. */
 360       fprintf (out, "-resume \n");
 361       fflush (out);
 362       fsync (fileno (out));
 363     }
 364   else
 365     {
 366       /* We are in the background; cancel the continue. */
 367       kill (getpid (), SIGSTOP);
 368     }
 369   errno = old_errno;
 370 }
 371
 372 /* Signal handler for SIGTSTP; notify the Emacs process that we are
 373    going to sleep.  Normally the suspend is initiated by Emacs via
 374    server-handle-suspend-tty, but if the server gets out of sync with
 375    reality, we may get a SIGTSTP on C-z.  Handling this signal and
 376    notifying Emacs about it should get things under control again. */
 377
 378 SIGTYPE
 379 handle_sigtstp (int signalnum)
 380 {
 381   int old_errno = errno;
 382   sigset_t set;
 383
 384   if (out)
 385     {
 386       fprintf (out, "-suspend \n");
 387       fflush (out);
 388       fsync (fileno (out));
 389     }
 390
 391   /* Unblock this signal and call the default handler by temprarily
 392      changing the handler and resignalling. */
 393   sigprocmask (SIG_BLOCK, NULL, &set);
 394   sigdelset (&set, signalnum);
 395   signal (signalnum, SIG_DFL);
 396   kill (getpid (), signalnum);
 397   sigprocmask (SIG_SETMASK, &set, NULL); /* Let's the above signal through. */
 398   signal (signalnum, handle_sigtstp);
 399
 400   errno = old_errno;
 401 }
 402
 403 /* Set up signal handlers before opening a frame on the current tty.  */
 404
 405 void
 406 init_signals (void)
 407 {
 408   /* Set up signal handlers. */
 409   signal (SIGWINCH, pass_signal_to_emacs);
 410
 411   /* Don't pass SIGINT and SIGQUIT to Emacs, because it has no way of
 412      deciding which terminal the signal came from.  C-g is now a
 413      normal input event on secondary terminals.  */
 414 #if 0
 415   signal (SIGINT, pass_signal_to_emacs);
 416   signal (SIGQUIT, pass_signal_to_emacs);
 417 #endif
 418
 419   signal (SIGCONT, handle_sigcont);
 420   signal (SIGTSTP, handle_sigtstp);
 421   signal (SIGTTOU, handle_sigtstp);
 422 }
 423
 424 \f
 425 #if !defined (HAVE_SOCKETS) || defined (NO_SOCKETS_IN_FILE_SYSTEM)
 426
 427 int
 428 main (argc, argv)
 429      int argc;
 430      char **argv;
 431 {
 432   fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n",
 433            argv[0]);
 434   fprintf (stderr, "on systems with Berkeley sockets.\n");
 435
 436   fail ();
 437 }
 438
 439 #else /* HAVE_SOCKETS */
 440
 441 #include <sys/types.h>
 442 #include <sys/socket.h>
 443 #include <sys/un.h>
 444 #include <sys/stat.h>
 445 #include <errno.h>
 446
 447 extern char *strerror ();
 448 extern int errno;
 449
 450 /* Three possibilities:
 451    2 - can't be `stat'ed                (sets errno)
 452    1 - isn't owned by us
 453    0 - success: none of the above */
 454
 455 static int
 456 socket_status (socket_name)
 457      char *socket_name;
 458 {
 459   struct stat statbfr;
 460
 461   if (stat (socket_name, &statbfr) == -1)
 462     return 2;
 463
 464   if (statbfr.st_uid != geteuid ())
 465     return 1;
 466
 467   return 0;
 468 }
 469
 470 /* Returns 1 if PREFIX is a prefix of STRING. */
 471 static int
 472 strprefix (char *prefix, char *string)
 473 {
 474   int i;
 475   if (! prefix)
 476     return 1;
 477
 478   if (!string)
 479     return 0;
 480
 481   for (i = 0; prefix[i]; i++)
 482     if (!string[i] || string[i] != prefix[i])
 483       return 0;
 484   return 1;
 485 }
 486
 487 int
 488 main (argc, argv)
 489      int argc;
 490      char **argv;
 491 {
 492   int s, i, needlf = 0;
 493   struct sockaddr_un server;
 494   char *cwd, *str;
 495   char string[BUFSIZ];
 496
 497   main_argc = argc;
 498   main_argv = argv;
 499   progname = argv[0];
 500
 501   /* Process options.  */
 502   decode_options (argc, argv);
 503
 504   if ((argc - optind < 1) && !eval && !tty && !window_system)
 505     {
 506       fprintf (stderr, "%s: file name or argument required\n", progname);
 507       fprintf (stderr, "Try `%s --help' for more information\n", progname);
 508       exit (1);
 509     }
 510
 511   /*
 512    * Open up an AF_UNIX socket in this person's home directory
 513    */
 514
 515   if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
 516     {
 517       fprintf (stderr, "%s: ", argv[0]);
 518       perror ("socket");
 519       fail ();
 520     }
 521
 522   server.sun_family = AF_UNIX;
 523
 524   {
 525     int sock_status = 0;
 526     int default_sock = !socket_name;
 527     int saved_errno = 0;
 528
 529      char *server_name = "server";
 530
 531      if (socket_name && !index (socket_name, '/') && !index (socket_name, '\\'))
 532        { /* socket_name is a file name component.  */
 533         server_name = socket_name;
 534         socket_name = NULL;
 535         default_sock = 1;       /* Try both UIDs.  */
 536        }
 537
 538      if (default_sock)
 539       {
 540         socket_name = alloca (100 + strlen (server_name));
 541         sprintf (socket_name, "/tmp/emacs%d/%s",
 542                  (int) geteuid (), server_name);
 543       }
 544
 545     if (strlen (socket_name) < sizeof (server.sun_path))
 546       strcpy (server.sun_path, socket_name);
 547     else
 548       {
 549         fprintf (stderr, "%s: socket-name %s too long",
 550                  argv[0], socket_name);
 551         fail ();
 552       }
 553
 554     /* See if the socket exists, and if it's owned by us. */
 555     sock_status = socket_status (server.sun_path);
 556     saved_errno = errno;
 557     if (sock_status && default_sock)
 558       {
 559         /* Failing that, see if LOGNAME or USER exist and differ from
 560            our euid.  If so, look for a socket based on the UID
 561            associated with the name.  This is reminiscent of the logic
 562            that init_editfns uses to set the global Vuser_full_name.  */
 563
 564         char *user_name = (char *) getenv ("LOGNAME");
 565
 566         if (!user_name)
 567           user_name = (char *) getenv ("USER");
 568
 569         if (user_name)
 570           {
 571             struct passwd *pw = getpwnam (user_name);
 572
 573             if (pw && (pw->pw_uid != geteuid ()))
 574               {
 575                 /* We're running under su, apparently. */
 576                 socket_name = alloca (100 + strlen (server_name));
 577                 sprintf (socket_name, "/tmp/emacs%d/%s",
 578                          (int) pw->pw_uid, server_name);
 579
 580                 if (strlen (socket_name) < sizeof (server.sun_path))
 581                   strcpy (server.sun_path, socket_name);
 582                 else
 583                   {
 584                     fprintf (stderr, "%s: socket-name %s too long",
 585                              argv[0], socket_name);
 586                     exit (1);
 587                   }
 588
 589                 sock_status = socket_status (server.sun_path);
 590                 saved_errno = errno;
 591               }
 592             else
 593               errno = saved_errno;
 594           }
 595       }
 596
 597      switch (sock_status)
 598        {
 599        case 1:
 600          /* There's a socket, but it isn't owned by us.  This is OK if
 601             we are root. */
 602          if (0 != geteuid ())
 603            {
 604              fprintf (stderr, "%s: Invalid socket owner\n", argv[0]);
 605              fail ();
 606            }
 607          break;
 608
 609        case 2:
 610          /* `stat' failed */
 611          if (saved_errno == ENOENT)
 612            fprintf (stderr,
 613                     "%s: Can't find socket; have you started the server?\n\
 614 To start the server in Emacs, type \"M-x server-start\".\n",
 615                     argv[0]);
 616          else
 617            fprintf (stderr, "%s: Can't stat %s: %s\n",
 618                     argv[0], server.sun_path, strerror (saved_errno));
 619          fail ();
 620          break;
 621        }
 622   }
 623
 624   if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
 625       < 0)
 626     {
 627       fprintf (stderr, "%s: ", argv[0]);
 628       perror ("connect");
 629       fail ();
 630     }
 631
 632   /* We use the stream OUT to send our command to the server.  */
 633   if ((out = fdopen (s, "r+")) == NULL)
 634     {
 635       fprintf (stderr, "%s: ", argv[0]);
 636       perror ("fdopen");
 637       fail ();
 638     }
 639
 640   /* We use the stream IN to read the response.
 641      We used to use just one stream for both output and input
 642      on the socket, but reversing direction works nonportably:
 643      on some systems, the output appears as the first input;
 644      on other systems it does not.  */
 645   if ((in = fdopen (s, "r+")) == NULL)
 646     {
 647       fprintf (stderr, "%s: ", argv[0]);
 648       perror ("fdopen");
 649       fail ();
 650     }
 651
 652 #ifdef HAVE_GETCWD
 653   cwd = getcwd (string, sizeof string);
 654 #else
 655   cwd = getwd (string);
 656 #endif
 657   if (cwd == 0)
 658     {
 659       /* getwd puts message in STRING if it fails.  */
 660
 661 #ifdef HAVE_GETCWD
 662       fprintf (stderr, "%s: %s (%s)\n", argv[0],
 663                "Cannot get current working directory", strerror (errno));
 664 #else
 665       fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno));
 666 #endif
 667       fail ();
 668     }
 669
 670   /* First of all, send our version number for verification. */
 671   fprintf (out, "-version %s ", VERSION);
 672
 673   if (nowait)
 674     fprintf (out, "-nowait ");
 675
 676   if (display)
 677     {
 678       fprintf (out, "-display ");
 679       quote_argument (display, out);
 680       fprintf (out, " ");
 681     }
 682
 683   if (tty)
 684     {
 685       char *tty_name = ttyname (fileno (stdin));
 686       char *type = getenv ("TERM");
 687
 688       if (! tty_name)
 689         {
 690           fprintf (stderr, "%s: could not get terminal name\n", progname);
 691           fail ();
 692         }
 693
 694       if (! type)
 695         {
 696           fprintf (stderr, "%s: please set the TERM variable to your terminal type\n",
 697                    progname);
 698           fail ();
 699         }
 700
 701       if (! strcmp (type, "eterm"))
 702         {
 703           /* This causes nasty, MULTI_KBOARD-related input lockouts. */
 704           fprintf (stderr, "%s: opening a frame in an Emacs term buffer"
 705                    " is not supported\n", progname);
 706           fail ();
 707         }
 708
 709       init_signals ();
 710
 711       fprintf (out, "-tty ");
 712       quote_argument (tty_name, out);
 713       fprintf (out, " ");
 714       quote_argument (type, out);
 715       fprintf (out, " ");
 716     }
 717
 718   if (window_system)
 719     fprintf (out, "-window-system ");
 720
 721   if ((argc - optind > 0))
 722     {
 723       for (i = optind; i < argc; i++)
 724         {
 725           int relative = 0;
 726
 727           if (eval)
 728             {
 729               /* Don't prepend any cwd or anything like that.  */
 730               fprintf (out, "-eval ");
 731               quote_argument (argv[i], out);
 732               fprintf (out, " ");
 733               continue;
 734             }
 735
 736           if (*argv[i] == '+')
 737             {
 738               char *p = argv[i] + 1;
 739               while (isdigit ((unsigned char) *p) || *p == ':') p++;
 740               if (*p == 0)
 741                 {
 742                   fprintf (out, "-position ");
 743                   quote_argument (argv[i], out);
 744                   fprintf (out, " ");
 745                   continue;
 746                 }
 747               else
 748                 relative = 1;
 749             }
 750           else if (*argv[i] != '/')
 751             relative = 1;
 752
 753           fprintf (out, "-file ");
 754           if (relative)
 755             {
 756               quote_argument (cwd, out);
 757               fprintf (out, "/");
 758             }
 759           quote_argument (argv[i], out);
 760           fprintf (out, " ");
 761         }
 762     }
 763   else
 764     {
 765       if (!tty && !window_system)
 766         {
 767           while ((str = fgets (string, BUFSIZ, stdin)))
 768             {
 769               if (eval)
 770                 fprintf (out, "-eval ");
 771               else
 772                 fprintf (out, "-file ");
 773               quote_argument (str, out);
 774             }
 775           fprintf (out, " ");
 776         }
 777     }
 778
 779   fprintf (out, "\n");
 780   fflush (out);
 781   fsync (fileno (out));
 782
 783   /* Maybe wait for an answer.   */
 784   if (nowait)
 785     {
 786       return 0;
 787     }
 788
 789   if (!eval && !tty)
 790     {
 791       printf ("Waiting for Emacs...");
 792       needlf = 2;
 793     }
 794   fflush (stdout);
 795   fsync (1);
 796
 797   /* Now, wait for an answer and print any messages.  */
 798   while ((str = fgets (string, BUFSIZ, in)))
 799     {
 800       char *p = str + strlen (str) - 1;
 801       while (p > str && *p == '\n')
 802         *p-- = 0;
 803
 804       if (strprefix ("-good-version ", str))
 805         {
 806           /* OK, we got the green light. */
 807         }
 808       else if (strprefix ("-emacs-pid ", str))
 809         {
 810           emacs_pid = strtol (string + strlen ("-emacs-pid"), NULL, 10);
 811         }
 812       else if (strprefix ("-print ", str))
 813         {
 814           str = unquote_argument (str + strlen ("-print "));
 815           if (needlf)
 816             printf ("\n");
 817           printf ("%s", str);
 818           needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
 819         }
 820       else if (strprefix ("-error ", str))
 821         {
 822           str = unquote_argument (str + strlen ("-error "));
 823           if (needlf)
 824             printf ("\n");
 825           printf ("*ERROR*: %s", str);
 826           needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
 827         }
 828       else if (strprefix ("-suspend ", str))
 829         {
 830           if (needlf)
 831             printf ("\n");
 832           needlf = 0;
 833           kill (0, SIGSTOP);
 834         }
 835       else
 836         {
 837           if (needlf)
 838             printf ("\n");
 839           printf ("*ERROR*: Unknown message: %s", str);
 840           needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n';
 841         }
 842     }
 843
 844   if (needlf)
 845     printf ("\n");
 846   fflush (stdout);
 847   fsync (1);
 848
 849   return 0;
 850 }
 851
 852 #endif /* HAVE_SOCKETS */
 853 \f
 854 #ifndef HAVE_STRERROR
 855 char *
 856 strerror (errnum)
 857      int errnum;
 858 {
 859   extern char *sys_errlist[];
 860   extern int sys_nerr;
 861
 862   if (errnum >= 0 && errnum < sys_nerr)
 863     return sys_errlist[errnum];
 864   return (char *) "Unknown error";
 865 }
 866
 867 #endif /* ! HAVE_STRERROR */
 868
 869 /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7
 870    (do not change this comment) */